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somatomammotropin

(sō-măt′ə-măm′ə-trōpĭn, sō′mə-tə-)
n.
  1. A peptide hormone biologically related to growth hormone but produced by the normal placenta and by certain neoplasms.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.